Php Socket programming host error - php

Question

I am new to sockets . I have taken reference from code from google but it doesn't seem to work .
I am posting server and client php files. Please identify the issue .
Server.php
<?php
$host = "xxx.xxx.xxx.xxx/myfolder/server.php"; //host
$port = 9000; //port
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP) ;
$result = socket_bind($socket, $host, $port);
$result = socket_listen($socket,5);
$spawn = socket_accept($socket);
$input = socket_read($spawn , 1024);
$output = strrev($input)."n";
socket_write($spawn, $output , strlen($output));
socket_close($spawn);
socket_close($socket);
?>
And here's the Client.php
<?
$host = "xxx.xxx.xxx.xxx/myfolder/server.php";
$port = 9000;
$socket = socket_create(AF_INET, SOCK_STREAM, 0) ;
$result = socket_connect($socket, $host, $port) ;
socket_write($socket, $message, strlen($message)) ;
$result = socket_read ($socket, 1024) ;
echo "Reply From Server :".$result;
socket_close($socket);
?>
after having both the above files on my public directory on my hosting.
I first run the command : php -q /var/www/html/myfolder/server.php
but i get this on my cmd shell :
$ php -q /var/www/html/myfolder/server.php
PHP Warning: socket_bind(): Host lookup failed [-10001]: Unknown host in /var/www/html/myfolder/server.php on line 13
Unable to bind socket at server
(and yes port 9000 is open )

Answer 1

When you create a socket server, you don't specify the host as the full URL to your script; that's why the bind is failing.
Take a look at this sample: http://www.php.net/manual/en/sockets.examples.php
#!/usr/local/bin/php -q
<?php
error_reporting(E_ALL);
/* Allow the script to hang around waiting for connections. */
set_time_limit(0);
/* Turn on implicit output flushing so we see what we're getting
* as it comes in. */
ob_implicit_flush();
$address = '192.168.1.53';
$port = 10000;
if (($sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) === false) {
echo "socket_create() failed: reason: " . socket_strerror(socket_last_error()) . "\n";
}
if (socket_bind($sock, $address, $port) === false) {
echo "socket_bind() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n";
}
if (socket_listen($sock, 5) === false) {
echo "socket_listen() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n";
}
do {
if (($msgsock = socket_accept($sock)) === false) {
echo "socket_accept() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n";
break;
}
/* Send instructions. */
$msg = "\nWelcome to the PHP Test Server. \n" .
"To quit, type 'quit'. To shut down the server type 'shutdown'.\n";
socket_write($msgsock, $msg, strlen($msg));
do {
if (false === ($buf = socket_read($msgsock, 2048, PHP_NORMAL_READ))) {
echo "socket_read() failed: reason: " . socket_strerror(socket_last_error($msgsock)) . "\n";
break 2;
}
if (!$buf = trim($buf)) {
continue;
}
if ($buf == 'quit') {
break;
}
if ($buf == 'shutdown') {
socket_close($msgsock);
break 2;
}
$talkback = "PHP: You said '$buf'.\n";
socket_write($msgsock, $talkback, strlen($talkback));
echo "$buf\n";
} while (true);
socket_close($msgsock);
} while (true);
socket_close($sock);
?>